I really don't know what they mean by:
Write a for-loop that iterates over start_list and .append()s each number squared (x ** 2) to square_list.
I tried this as my code:
start_list = [5, 3, 1, 2, 4] square_list =  for x in start_list: start_list.append() square_list.sort() print square_list
But I get this error:
Traceback (most recent call last):
File "python", line 5, in